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Patterns
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Two Pointers
Two Pointers
Master these 22 problems to understand the Two Pointers pattern.
Start Here
125. Valid Palindrome
Easy
88. Merge Sorted Array
Easy
26. Remove Duplicates from Sorted Array
Easy
283. Move Zeroes
Easy
977. Squares of a Sorted Array
Easy
344. Reverse String
Easy
Core Interview Set
167. Two Sum II – Input Array Is Sorted
Medium
15. 3Sum
Medium
11. Container With Most Water
Medium
75. Sort Colors
Medium
680. Valid Palindrome II
Easy
844. Backspace String Compare
Easy
Sliding / Two-Pointer Crossover
3. Longest Substring Without Repeating Characters
Medium
567. Permutation in String
Medium
209. Minimum Size Subarray Sum
Medium
424. Longest Repeating Character Replacement
Medium
992. Subarrays with K Different Integers
Hard
Advanced Must-Do
42. Trapping Rain Water
Hard
18. 4Sum
Medium
881. Boats to Save People
Medium
763. Partition Labels
Medium
838. Push Dominoes
Medium